"While much of the tech world views a two-year-old smartphone as hopelessly obsolete, large swaths of our transportation and military infrastructure, some modern businesses, and even a few computer programmers rely daily on technology that hasn't been updated for decades." Back when I still worked at a hardware and plumbing store - up until about 4-5 years ago - we used MS-DOS cash registers. They are still in use today. If it works, it works.